I was recently given Turnigy voltage detector, but was unsure about how to install it on the apm1 board. I checked the wiki, which has a instruction for the AttoPilot sensor, which has 3 wires, while this one only have 2 (red and black).

Do I just solder the red and black wire to the same hole that the red and black wire of the attopilot sensor goes? I tried to use a multimeter to check the voltage between those two hole and got very low voltage, so I'm not sure if that is correct.